An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na

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Solution

(d) Na
Na is soft and can be cut with a knife. It is very reactive and cannot be kept in open air. It reacts vigorously with water.

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An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:

Q. Question 25
An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following:
(a)

Mg

(b)

Na

(c)

P

(d)

Ca

Q. An element

A

is soft and can be cut with a knife. This is very reactive with air and cannot be kept open in the air. It reacts vigorously with water. The element

A

is:

An element is soft can be cut easily with a knife.It is very reactive and cannot be kept open in the air.It reacts vigorously with water.This element is most likely to be:

(a) magnesium

(b) potassium

(d) aluminium

An element X reacts with water to form a solution which turns phenolphthalein indicator pink.The element X is most likely to be:

(a) sulphur

(b) sodium

(d) silicon

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An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be: (a) Mg (b) S (c) P (d) Na

(d) Na Na is soft and can be cut with a knife. It is very reactive and cannot be kept in open air. It reacts vigorously with water.

An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na

(d) Na
Na is soft and can be cut with a knife. It is very reactive and cannot be kept in open air. It reacts vigorously with water.